Failure Code [Ca322] Injector #1 Open/Short Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA322] Injector #1 open/short error

Action code Failure code
E03
Contents of
• There is disconnection or short circuit in drive circuit of injector No. 1.
trouble
Action of
• Turns the centralized warning lamp and alarm buzzer ON.
controller
Problem that
• There is irregular combustion or hunting.
appears on
• Engine output drops.
machine
Related
• Method of reproducing failure code: Start engine
information
1 Defective injector No. 1
Disconnection in wiring har-
ness
2
(Disconnection or defective
contact in connector)
Ground fault in wiring har-
3 ness
(Contact with ground circuit)
Possible causes
and standard
value in normal
state
Short circuit in wiring har-
4 ness
(with another wiring harness)
Defective wiring harness
5
connector
Defective other cylinder
6
injector or harness
7 Defective engine controller
36
40-320
Trouble
CA322
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA322] Injector #1 open/short error
Injector #1 open/short error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
INJ CYL 1
Between (1) and (2)
Between (1) and ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (45) –
INJ CYL 1 (1)
Wiring harness between EC1 (female) (53) –
INJ CYL 1 (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (45) –
INJ CYL 1 (1) and ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC1
(female) (45) – EC1 (female) (With all con-
nectors of wiring harness disconnected)
Wiring harness among all pins between EC1
(female) (53) – EC1 (female) (With all con-
nectors of wiring harness disconnected)
Connecting parts among injector No. 1, engine wiring harness, and
engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
If other failure codes are indicated simultaneously, carry out trouble-
shooting for them.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
EC1 (female)
Between (45) and (53)
Between (45) and ground
1
Resistance
Max. 2 z
Min. 100 kz
Resis-
Max. 2 z
tance
Resis-
Max. 2 z
tance
Resis-
Max. 2 z
tance
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
Resistance
Max. 2 z
Min. 100 kz
WA250, 250PZ-6